As I say: we’ll see. My expectation is that he won’t (because he can’t) force Churches to marry gays, but he will devise punishments for those that refuse to do so. Since the state largely does this via lawyers, guns and money, I expect these will be the tools deployed here: mainly lawyers and money. Declaring the Catholic Church a “hate group” is a favorite species of rhetoric in some circles. That will likely be an avenue for exploration, followed economic punishment of some kindm, such as revoking tax exempt status on some pretext or other.